* If no suffix, then inputDir must be different from outputDir
* or we go into an infinite loop. Already checked through
* checkMyParams.
*/
_theFilter = new IgnoreFile(_workingSuffix, _errorSuffix, _postProcessSuffix);
/*
* If no input suffix, then we must have a work suffix and we
* must ignore worker files when sourcing new input files, or
* we end up in an infinite loop.